# US 10,504,544 B2 · Magnetic head and magnetic recording and reproducing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,544 B2 - Document ID: US10504544B2 - Status: Granted - Kind: B2 - Application number: 16/119,395 - Filed: 2018-08-31 - Published: 2019-09-05 - Granted: 2019-12-10 - Earliest claimed: 2018-03-01 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Kabushiki Kaisha Toshiba - Inventors: Michinaga Yamagishi; Tazumi Nagasawa - Web page: https://patentgrep.com/patent/US10504544B2 ## CPC - G11B 5/3903: {using magnetic thin film layers or their effects, the films being part of integrated structures} - G11B 5/3945: {Heads comprising more than one sensitive element} - G11B 5/35: having vibrating elements - H01F 10/3286: {Spin-exchange coupled multilayers having at least one layer with perpendicular magnetic anisotropy} - H01F 10/329: {Spin-exchange coupled multilayers wherein the magnetisation of the free layer is switched by a spin-polarised current, e.g. spin torque effect} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract According to one embodiment, a magnetic head includes a reproducing portion. The reproducing portion includes first to fourth magnetic portions and a stacked body. The third magnetic portion is provided between the first and second magnetic portions. The fourth magnetic portion is provided between the first and second magnetic portions. A second direction from the third magnetic portion toward the fourth magnetic portion crosses a first direction from the first magnetic portion toward the second magnetic portion. The stacked body is provided between the first and second magnetic portions in the first direction and between the third and fourth magnetic portions in the second direction. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic portion in the first direction, and an intermediate layer provided between the first and second magnetic layers in the first direction. ## Claims ### Claim 1 A magnetic head, comprising a reproducing portion, the reproducing portion including: a first magnetic portion; a second magnetic portion; a third magnetic portion provided between the first magnetic portion and the second magnetic portion; a fourth magnetic portion provided between the first magnetic portion and the second magnetic portion, a second direction from the third magnetic portion toward the fourth magnetic portion crossing a first direction from the first magnetic portion toward the second magnetic portion; a stacked body provided between the first magnetic portion and the second magnetic portion in the first direction and between the third magnetic portion and the fourth magnetic portion in the second direction; an insulating portion provided between the fourth magnetic portion and the first magnetic portion; and another insulating portion provided between the fourth magnetic portion and the second magnetic portion, the stacked body including: a first magnetic layer; a second magnetic layer provided between the first magnetic layer and the second magnetic portion in the first direction; and an intermediate layer provided between the first magnetic layer and the second magnetic layer in the first direction, the intermediate layer being nonmagnetic, the third magnetic portion contacting the first magnetic portion, the fourth magnetic portion contacting the second magnetic portion. ### Claim 2 (depends on 1) The magnetic head according to claim 1, wherein an orientation of a first magnetization of the first magnetic portion includes a reverse component of an orientation of a second magnetization of the second magnetic portion, an orientation of a third magnetization of the third magnetic portion includes a component in the orientation of the first magnetization, and an orientation of a fourth magnetization of the fourth magnetic portion includes a component in the orientation of the second magnetization. ### Claim 3 (depends on 1) The magnetic head according to claim 1, wherein a first magnetization of the first magnetic portion is aligned with an orientation from the third magnetic portion toward the fourth magnetic portion, a second magnetization of the second magnetic portion is aligned with an orientation from the fourth magnetic portion toward the third magnetic portion, a third magnetization of the third magnetic portion is aligned with the orientation from the third magnetic portion toward the fourth magnetic portion, and a fourth magnetization of the fourth magnetic portion is aligned with the orientation from the fourth magnetic portion toward the third magnetic portion. ### Claim 4 (depends on 1) The magnetic head according to claim 1, wherein a first magnetization of the first magnetic portion is aligned with an orientation from the fourth magnetic portion toward the third magnetic portion, a second magnetization of the second magnetic portion is aligned with an orientation from the third magnetic portion toward the fourth magnetic portion, a third magnetization of the third magnetic portion is aligned with the orientation from the fourth magnetic portion toward the third magnetic portion, and a fourth magnetization of the fourth magnetic portion is aligned with the orientation from the third magnetic portion toward the fourth magnetic portion. ### Claim 5 (depends on 1) The magnetic head according to claim 1, wherein the reproducing portion further includes a fifth magnetic portion, the fifth magnetic portion is positioned between the first magnetic portion and the second magnetic portion in the first direction, and a third direction from the stacked body toward the fifth magnetic portion crosses the first direction and the second direction. ### Claim 6 (depends on 5) The magnetic head according to claim 5, wherein a fifth magnetization of the fifth magnetic portion is aligned with the third direction. ### Claim 7 (depends on 5) The magnetic head according to claim 5, wherein the reproducing portion has a first surface, and at least a portion of the stacked body is positioned between the first surface and the fifth magnetic portion in the third direction. ### Claim 8 (depends on 1) The magnetic head according to claim 1, further comprising a first interconnect and a second interconnect, one end of the first interconnect being electrically connected to the first magnetic layer, one end of the second interconnect being electrically connected to the second magnetic layer, another end of the first interconnect and another end of the second interconnect being connectable to a controller, the controller being configured to supply a current between the first magnetic layer and the second magnetic layer. ### Claim 9 (depends on 8) The magnetic head according to claim 8, wherein an oscillation is generated in the stacked body when the current flows between the first magnetic layer and the second magnetic layer, and a frequency of the oscillation changes according to an orientation of a magnetization of a magnetic recording medium. ### Claim 10 (depends on 9) The magnetic head according to claim 9, wherein information of the magnetic recording medium is reproduced using the change of the frequency of the oscillation. ### Claim 11 (depends on 1) A magnetic recording and reproducing device, comprising: the magnetic head according to claim 1; a magnetic recording medium; and a controller, the controller being configured to supply a current between the first magnetic layer and the second magnetic layer, an oscillation being generated in the stacked body when the current flows between the first magnetic layer and the second magnetic layer, information of the magnetic recording medium being read by detecting a change of a frequency of the oscillation corresponding to an orientation of a magnetization of the magnetic recording medium.